Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a58bfd93100c2c0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 09:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 20cddb0965249768a6323bfa071ed575 SHA-1: b318d219f4561d116b6a9b42c86d12e4974305fa SHA-256: 8a58bfd93100c2c032173af77fdaf11bd1c505c2d6a32bb9c42ab402e3bcd3f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/21607974790.pdf In PDF document text
    • https://niboparis.com/upload/fckeditor/files/simogipiwukukulog.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/jozaremavokosexivunil.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/nurosulogazagezurad.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/tazagipaje.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/86266958577.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mafupesawu.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/25710791219.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/48473405098.pdfIn PDF document text
    • https://birotex.rs/images/files/49237088315.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/38701061788.pdfIn PDF document text
    • https://viettrungson.com/media/Files/69268158310.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/39508738443.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23324800922.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/53733899441.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/najigij.pdfIn PDF document text
    • http://kechengchem.com/upload/files/vunure.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/vamefigo.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/nabadumife.pdfIn PDF document text
    • https://eklyps.net/images/file/rufupuxakadepuniwosidotif.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17281710375.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/70105781005.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/mamefizuxapopuf.pdfIn PDF document text
    • http://superbarter.sk/media/file/84317699612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=paper+io+2+play+online+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10320 bytes
SHA-256: 37b6f73a196cee96c56195d04e0824e51abbbdd76c7f3644e5731f31cd660766
font_02_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 16852 bytes
SHA-256: 50be866febca12a37fd8b9d99601ba947fcad44dfe2392d7e258bac967a85171